Malicious PDF — malware analysis report

Static analysis result for SHA-256 705c34ac555a582c…

MALICIOUS

PDF

44.1 KB Created: 2020-11-09 15:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f032e1df6399db17d78e08ac16a58164 SHA-1: 81cbc1060843a6a6b0f746a0d687620270703290 SHA-256: 705c34ac555a582ca16e6c44b3ff4020d8f13155dda994d96544911bfbb82154
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms a large number of external links were embedded. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/strik?keyword=c+band+satellite+dish+antenna PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401973/normal_5fa1a2e4cfd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f87552f53743.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_5f8ba29f92a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f8bea09eaaef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_5f908b2d85978.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/lojibekiribux_jogito_vuraza_vufatadexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8d8be36c996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f88f8a1c49b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f9bcba0399b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/phonetic_alphabet_nato.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/escuela_dominical_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848f2a53-6ae5-4b51-aa4c-49ceff58f908/10182092759.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/vukobovakos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CF 4656 bytes
SHA-256: 9434deb6026771751203f22044f5c9358fac38876dd6f25e7b3595c4fea39fdc
font_01_sfnt_off00007291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7291 10296 bytes
SHA-256: 6538f2b2a1ccf3714eea9f36c4e1107328bb263cb49ca8366a6a01d8adf1599b
font_02_sfnt_off000095a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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